Amphoterus (son of Alcmaeon)

Amphoterus (son of Alcmaeon)

Lesserwell-documentedAncient Greek heroic-mythic traditionPsophis (Arcadia)regions of the Epigoni cycleDelphi (contextual association)
Origin

Amphoterus is named in mythic genealogies as the son of Alcmaeon by Callirrhoe, daughter of the river-god Achelous. His narrative role arises after the murder of Alcmaeon: in several accounts Amphoterus and his brother Acarnan unexpectedly attain adult stature at the same moment, enabling them to pursue vengeance for their father's death. Sources place these events within the wider cycle of the Epigoni and link them to locales such as the burial of Alcmaeon at Psophis and episodes involving the robe and necklace associated with Harmonia and Delphi.

Appearance

Primary source summaries emphasize a striking motif rather than a detailed physical portrait: Amphoterus (with his brother Acarnan) is said to have 'suddenly become grown-up' — an abrupt maturation from childhood to adult form noted in multiple accounts. Beyond the sudden maturation and their subsequent presence among avengers/warriors in the narrative (for example meeting others while bearing the robe/necklace episode), no consistent descriptive details (clothing, weapons, features) are supplied in the cited materials.

Abilities

Amphoterus is characterized by his role and actions rather than by sustained supernatural powers: he participates with Acarnan in avenging their father Alcmaeon. The sudden maturation that enables their actions is consistently reported; one secondary source explicitly attributes the transformation to Zeus, but this specific agency is not uniformly attested across the cited texts, so the core attested ability is limited to the extraordinary coming-of-age and the filial vengeance they enact. No other magical or divine powers are recorded in the provided sources.

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Sources
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    Apollodorus, The Library (Book 3). Apollodorus, The Library, Book 3 (summary editions consulted via Theoi)literary
well-documented